Technical > Matt Shaff's Engine Shop
Basic 355 combo
opa1:
I bought a 179wb Jr.Fuel roller. I want to set it up with a carb, gas and zoomies. I'm not really concerned how quick it is. I just want to have fun. It will also only run the 1/8 mile and is my first FED.
I would think the all up weight with driver is around 1500#. Not sure on this just a guess. The drivetrain specs are 4:86 gear, 31" tire, 1:76 glide.
I have a forged and balanced 355 flattop .005 deck short block. The cam I'm looking at is a Howards 112072-06. Specs out at 246/246 @ .050, 515/515 lift @ 1.5 ratio/ 549 @ 1.6 ratio, 106 on 102. 3200-6700 range. I have a std Victor Jr. 2975 and 750 carb.
For heads I have a choice of
Performer RPM @ 2.02/1.6/170cc port/72cc chamber. DCR 7.52 static 9.22
World products S/R 1.94/1.5/ 170cc port/58cc chamber DCR 8.74 static 10.76
Engine Quest vortec style 1.94/1.5 170cc/64cc chamber DCR 8.26 static 10.15
I have the Performer RPM heads. The other heads were what I'm looking at. Does this combo look to be somewhere close? Any suggestions on which heads and compression to use?
jeff/21:
we ran something similar flat top vortec heads 58cc o deck .030 head gasket carb on gas 4.86 gears and 10"x 30" tire we could hot lap it very consistent good fed bracket car. when we started to add hp changed tires to 10x33 then it started to run hot and we changed to alky at first with a carb then injection.everything was normal again got rid of the water pump and rad we also tried 4.56 and 4.10 gears always ran better with 4.86
keep it simple and have fun
opa1:
Thanks for your input. I'd like to go injection and alky, just not in the budget right now. I should have room for the horizontal radiator/fan.
What were your RPM's and speed in the 1/8 with the 4.86 10x30 tire?
Frontenginedragsters:
OPA1:
This is a copy of a posting I answered from just a few weeks ago:
Last year [2016 and 2017] we ran a 355 S.B.Chevy in a 175" WB Front engine dragster.
33" tall tires, 4.11 gear and Powerglide NO Trans Break. Leaving off idle.
Engine was very basic. 10 to 1 compression and un-ported 461 castings.
Enderle stacks on alcohol.
Camshaft was a Engle Flat Tappet Solid. 247*/252* on a 110* lobe separation.
Car ran 5.64 @ 122 MPH in the 1/8
It was assembled as a stepping stone from a Jr Dragster for our youngest son.
We had a ball racing it and won several local races.
If you use the cylinder heads that you own, your lower compression ratio will let you use cheaper gas.
Brings the cost of racing down and the fun up.
Matt Shaff
Pro-Formance Specialties
585-288-1499
opa1:
--- Quote from: Frontenginedragsters on March 29, 2018, 08:06:01 AM ---OPA1:
This is a copy of a posting I answered from just a few weeks ago:
Last year [2016 and 2017] we ran a 355 S.B.Chevy in a 175" WB Front engine dragster.
33" tall tires, 4.11 gear and Powerglide NO Trans Break. Leaving off idle.
Engine was very basic. 10 to 1 compression and un-ported 461 castings.
Enderle stacks on alcohol.
Camshaft was a Engle Flat Tappet Solid. 247*/252* on a 110* lobe separation.
Car ran 5.64 @ 122 MPH in the 1/8
It was assembled as a stepping stone from a Jr Dragster for our youngest son.
We had a ball racing it and won several local races.
If you use the cylinder heads that you own, your lower compression ratio will let you use cheaper gas.
Brings the cost of racing down and the fun up.
Matt Shaff
Pro-Formance Specialties
585-288-1499
--- End quote ---
That combo is very close to mine too. Any reason for running the 110 lsa other than a wider power curve? I've done some reading about using zoomies with gas/carb. I came up with mixed thoughts on it.
Using the performer rpm's will kick some of the dcr out but, it would be pump gas friendly. The aluminum would stay cooler too.
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